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Phineas Flynn and his stepbrother, Ferb Fletcher, are determined to make every day of their summer vacation fun. They try building a full-scale roller coaster, becoming musicians, building a backyard beach, and traveling back in time to meet dinosaurs. Their family pet, Perry the Platypus, doubles as a secret agent and battles evil. Meanwhile, older sister Candace is tattling on them to Mom and Dad, though she can never seem to catch them in the act.
S2, EP37 "Split Personality; Brain Drain"
Candace is split into two Candaces; Phineas and Ferb make a sick day triathlon.
S2, EP39 "Make Play; Candace Gets Busted"
Candace switches places with a princess who looks just like her; Linda and Lawrence take a trip and they entrust Candace to be in charge of the house.
S2, EP38 "Rollercoaster: The Musical! Part I & Part II"
In this musical, Phineas and Ferb revisit the day they built their gigantic rollercoaster.
S2, EP33 "Nerds of a Feather, Part I & II"
At the annual Comic Book Convention, Phineas and Ferb are caught in the middle of a duel between the fantasy fans and the sci-fi fans, and the boys must get them to set aside their differences so that they can get back to having fun.
S5, EP15 "Space Adventure; Droogenfest"
While Buford is sick, Baljeet makes him watch an episode of his favorite show, "Space Adventure!"; Isabella works with Doof to bake a giant pastry to impress foreign emissaries.
S5, EP14 "Bend It Like Doof; Dooflicated"
OWCA and LOVEMUFFIN face off in a soccer match while the boys help Buford with his aim; people around Danville turn evil after being hit by Doof's latest inator.
S5, EP13 "The Nightmare-Inator; Doof in Retrograde"
Doof's dream-project-inator misfires and projects people's dreams for all to see; Doof becomes the center of his own solar system while Irving tries to impress Phineas and Ferb.
S5, EP12 "The Bad Old Days; Mantis Fact"
Vanessa and Doof travel to Drusselstein while the boys dig for Mom's lost wedding ring; the kids build a bird mansion for a rare macaw while Doof deals with giant praying mantises.